Know Your Environment. Protect Your Health.

Nitrate and nitrite

Chrisman

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.

 

33

Samples

0

Samples exceeding legal limit (MCL)

32

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.65 ppm21ND - 3.30 ppm
20191.74 ppm11110.150 ppm - 2.70 ppm
20201.01 ppm11110.340 ppm - 1.80 ppm
20211.03 ppm880.760 ppm - 1.70 ppm
20221.10 ppm111.10 ppm
2023N/A00N/A

ppm = parts per million

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.14 ppm

The EWG health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

EPA Maximum Contaminant
Level (MCL): 10 ppm

ppm = parts per million

All test results

Date Lab ID Result
2018-04-1918D0511-01_02ND
2018-10-038101159-013.30 ppm
2019-01-299014520-012.60 ppm
2019-02-199023324-011.01 ppm
2019-03-059030715-012.10 ppm
2019-04-159043510-012.70 ppm
2019-05-209054140-012.40 ppm
2019-06-129062530-012.10 ppm
2019-07-029070787-012.30 ppm
2019-08-159083592-012.40 ppm
2019-09-239094554-010.560 ppm
2019-10-179103985-010.150 ppm
2019-11-199113516-010.830 ppm
2020-01-230014338-020.970 ppm
2020-04-220044224-010.340 ppm
2020-05-050050867-010.900 ppm
2020-06-030061127-010.860 ppm
2020-07-210074482-011.40 ppm
2020-08-030080365-011.26 ppm
2020-09-150093457-010.810 ppm
2020-10-070101758-010.820 ppm
2020-11-040111114-011.000 ppm
2020-12-020120768-011.80 ppm
2020-12-040121170-011.000 ppm
2021-01-12EA02046-010.950 ppm
2021-02-22EB03601-010.760 ppm
2021-03-31ED00026-010.940 ppm
2021-04-12ED02349-010.970 ppm
2021-05-19EE03985-011.03 ppm
2021-07-07EG01353-011.70 ppm
2021-08-18EH04143-010.900 ppm
2021-09-08EI01496-011.000 ppm
2022-12-22FL04292-011.10 ppm